US20040125838A1 - Light emitter with a voltage dependent resistor layer - Google Patents
Light emitter with a voltage dependent resistor layer Download PDFInfo
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- US20040125838A1 US20040125838A1 US10/249,804 US24980403A US2004125838A1 US 20040125838 A1 US20040125838 A1 US 20040125838A1 US 24980403 A US24980403 A US 24980403A US 2004125838 A1 US2004125838 A1 US 2004125838A1
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- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/05573—Single external layer
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/05599—Material
- H01L2224/056—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/06—Structure, shape, material or disposition of the bonding areas prior to the connecting process of a plurality of bonding areas
- H01L2224/0601—Structure
- H01L2224/0603—Bonding areas having different sizes, e.g. different heights or widths
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
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- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/17—Structure, shape, material or disposition of the bump connectors after the connecting process of a plurality of bump connectors
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- H01L24/02—Bonding areas ; Manufacturing methods related thereto
- H01L24/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
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- H01L24/02—Bonding areas ; Manufacturing methods related thereto
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- H01L24/10—Bump connectors ; Manufacturing methods related thereto
- H01L24/12—Structure, shape, material or disposition of the bump connectors prior to the connecting process
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- H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
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- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention relates to a light emitter, and more particularly, a light emitter with a voltage dependent resistor layer.
- Light emitters are widely used in optical displays, laser diodes, traffic lights, data storage devices, communications devices, ruminating equipments, and medical equipments.
- FIG. 1 shows a related art packaged light emitter 100 .
- a light emitter 102 is packaged with a set of zener diodes 104 for releasing static electricity so as to avoid damaging the light emitter 102 .
- the zener diodes 104 are connected when packaging the light emitter 102 . Therefore no element is provided to discharge static electrically before packaging the light emitter 102 . And the light emitter 102 may be damaged by static electricity before it is packaged. Further, the introduction of the zener diodes 104 will complicate the packaging process thereby incurring extra cost.
- FIG. 2 shows a light emitting diode 150 bonded with a silicon doped diode 152 disclosed in a published U.S. patent application 2002/0179914.
- the silicon doped diode 152 is connected to the light emitting diode 150 with a covalent bond.
- the silicon doped diode 152 is used to release static electricity accumulated on the light emitting diode 150 to avoid damaging the light emitting diode 150 .
- the covalent bond between the silicon doped diode 152 and the light emitting diode 150 is formed after the light emitting diode 150 is formed. Therefore the light emitting diode 150 may be damaged before the covalent bond is formed. And the covalent bond also incur additional expense to the structure.
- the light emitter comprises a substrate, and an emitting stack formed on the substrate.
- the emitting stack comprises a first contact layer having a first surface area and a second surface area, a first cladding layer formed on the first surface area, an emitting layer formed on the first cladding layer, a second cladding layer formed on the emitting layer, and a second contact layer formed on the second cladding layer.
- the light emitter further comprises a first electrode formed on the second surface area of the first contact layer, a second electrode formed on the second contact layer, and a voltage dependent resistor layer formed on the emitting stack and connected to the first electrode and the second electrode.
- the light emitter comprises a transparent substrate, and an emitting stack formed on the transparent substrate.
- the emitting stack comprises a first contact layer having a first surface area and a second surface area, a first cladding layer formed on the first surface area, an emitting layer formed on the first cladding layer, a second cladding layer formed on the emitting layer, and a second contact layer formed on the second cladding layer.
- the light emitter further comprises a first electrode formed on the second surface area of the first contact layer, a second electrode formed on the second contact layer, a first solder layer formed on the first electrode, a second solder layer formed on the second electrode, a first metal layer formed on the first solder layer, a second metal layer formed on the second solder layer, and a voltage dependent resistor layer connected to the first metal layer and the second metal layer, and a carrier formed on the first metal layer, second metal layer and voltage dependent resistor layer.
- the light emitter comprises a first electrode, a conductive substrate formed on the first electrode, a Distributed Bragg reflector layer formed on the conductive substrate, a first cladding layer formed on the Distributed Bragg reflector layer, an emitting layer formed on the first cladding layer, a second cladding layer formed on the emitting layer, a second contact layer formed on the second cladding layer, a second electrode formed on the second contact layer, and a voltage dependent resistor layer connected to the first electrode and the second electrode.
- FIG. 1 shows a related art packaged light emitter.
- FIG. 2 shows a light emitting diode bonded with a silicon doped diode disclosed in a published U.S. patent application 2002/0179914.
- FIG. 3 shows a first light emitter according to the present invention.
- FIG. 4 shows a current vs. voltage relationship of the voltage dependent resistor layer in FIG. 3.
- FIG. 5 is an equivalent circuit of the light emitter in FIG. 3.
- FIG. 6 shows a second light emitter according to the present invention.
- FIG. 7 shows a third light emitter according to the present invention.
- FIG. 3 shows a first light emitter 1 according to the present invention.
- the light emitter 1 comprises a substrate 10 , and an emitting stack 9 formed on the substrate 10 .
- the emitting stack 9 comprises a first contact layer 11 having a first surface area and a second surface area, a first cladding layer 12 formed on the first surface area, an emitting layer 13 formed on the first cladding layer 12 , a second cladding layer 14 formed on the emitting layer 13 , and a second contact layer 15 formed on the second cladding layer 14 .
- the light emitter 1 further comprises a first electrode 16 formed on the second surface area of the first contact layer 11 , a second electrode 17 formed on the second contact layer 15 , and a voltage dependent resistor layer 18 formed on the emitting stack 9 and connected to the first electrode 16 and the second electrode 17 .
- FIG. 4 shows a current vs. voltage relationship of the voltage dependent resistor layer 18 .
- the voltage dependent resistor layer 18 exhibits a very high resistance, and current is minimal.
- resistance of the voltage dependent resistor layer 18 decreases as the voltage increases. Therefore, when static electricity induced the voltage across the voltage dependent resistor layer 18 is higher than V S or lower than V S , electric charges will be released through the voltage dependent resistor layer 18 .
- FIG. 5 is an equivalent circuit of the light emitter 1 .
- V S voltage dependent resistor layer 18
- V S voltage dependent resistor layer 18
- electric charges will be released through the voltage dependent resistor layer 18 , rather than through the emitting stack 9 , thus preventing the emitting stack 9 from being damaged by electric charges.
- FIG. 6 shows a second light emitter 2 according to the present invention.
- the light emitter 2 comprises a transparent substrate 20 , and an emitting stack 19 formed on the transparent substrate 20 .
- the emitting stack 19 comprises a first contact layer 21 having a first surface area and a second surface area, a first cladding layer 22 formed on the first surface area, an emitting layer 23 formed on the first cladding layer 22 , a second cladding layer 24 formed on the emitting layer 23 , and a second contact layer 25 formed on the second cladding layer 24 .
- the light emitter 2 further comprises a first electrode 26 formed on the second surface area of the first contact layer 21 , a second electrode 27 formed on the second contact layer 25 , a first solder layer 28 formed on the first electrode 26 , a second solder layer 29 formed on the second electrode 27 , a first metal layer 200 formed on the first solder layer 28 , a second metal layer 201 formed on the second solder layer 29 , and a voltage dependent resistor layer 202 connected to the first metal layer 200 and the second metal layer 201 , and a carrier 203 formed on the first metal layer 200 , second metal layer 201 and voltage dependent resistor layer 202 .
- FIG. 7 shows a third light emitter 3 according to the present invention.
- the light emitter 3 comprises a first electrode 36 , a conductive substrate 30 formed on the first electrode 36 , a Distributed Bragg reflector layer 31 formed on the conductive substrate 30 , a first cladding layer 32 formed on the Distributed Bragg reflector layer 31 , an emitting layer 33 formed on the first cladding layer 32 , a second cladding layer 34 formed on the emitting layer 33 , a second contact layer 35 formed on the second cladding layer 34 , a second electrode 37 formed on the second contact layer 35 , and a voltage dependent resistor layer 38 connected to the first electrode 36 and the second electrode 37 .
- a first transparent oxide conductive layer 7 can be formed between the first electrode 16 , 26 and the second surface area of the first contact layer 11 , 21 of the light emitter 1 , 2 .
- a second transparent oxide conductive layer 8 can be formed between the second electrode 17 , 27 , 37 and the second contact layer 15 , 25 , 35 of the light emitter 1 , 2 , 3 .
- the substrate 10 comprises at least one material selected from a group consisting of Si, GaAs, SiC, GaP, AlGaAs, GaAsP, Al2O3, glass materials, and other replaceable materials.
- the transparent substrate 20 comprises at least one material selected from a group consisting of GaP, AlGaAs, GaAsP, Al2O3, glass materials, and other replaceable materials.
- the conductive substrate 30 comprises at least one material selected from a group consisting of GaP, AlGaAs, GaAsP, SiC, GaAs, Si, and other replaceable materials.
- Each of the transparent oxide conductive layers comprises at least one material selected from a group consisting of indium tin oxide, cadmium tin oxide, antimony tin oxide, zincoxide, zinc tin oxide, and other replaceable materials.
- the first cladding layer 12 , 22 , 32 comprises at least one material selected from a group consisting of AlGaInP, AlN, GaN, AlGaN, InGaN, AlGaInN, and other replaceable materials.
- the emitting layer 13 , 23 , 33 comprises at least one material selected from a group consisting of AlGaInP, GaN, InGaN, AlGaInN, and other replaceable materials.
- the second cladding layer 14 , 24 , 34 comprises at least one material selected from a group consisting of AlGaInP, AlN, GaN, AlGaN, InGaN, AlGalnN, and other replaceable materials.
- the first contact layer 11 , 21 comprises at least one material selected from a group consisting of GaP, GaAs, GaAsP, InGaP, AlGaInP, AlGaAs, GaN, InGaN, AlGaN, AlGaInN, and other replaceable materials.
- the second contact layer 15 , 25 , 35 comprises at least one material selected from a group consisting of GaP, GaAs, GaAsP, InGaP, AlGaInP, AlGaAs, GaN, InGaN, AlGaN, AlGaInN, and other replaceable materials.
- the Distributed Bragg reflector layer 31 comprises at least one material selected from a group consisting of AlAs, GaAs, AlGaAs, and other replaceable materials.
- the voltage dependent resistor layer 18 , 202 , 38 comprises at least one material selected from a group consisting of ZnO, CaF 2 , ZnS, TiO 2 , Al—Al 2 O 3 —Au, Co—NiO, polymethyl-methylacrylate, SrTiO 3 , and other replaceable materials.
- the voltage dependent resistor layer 18 , 202 , 38 used to release electric charges is formed during the formation of the light emitter 1 , 2 , 3 , thus greatly enhancing the yield of the light emitter 1 , 2 , 3 . Further, after the light emitter 1 , 2 , 3 is formed, no subsequent process is needed to prevent static electricity discharge damage.
Abstract
Description
- 1. Field of the Invention
- The present invention relates to a light emitter, and more particularly, a light emitter with a voltage dependent resistor layer.
- 2. Description of the Prior Art
- Light emitters are widely used in optical displays, laser diodes, traffic lights, data storage devices, communications devices, ruminating equipments, and medical equipments.
- Please refer to FIG. 1. FIG. 1 shows a related art packaged
light emitter 100. As shown in FIG. 1, alight emitter 102 is packaged with a set ofzener diodes 104 for releasing static electricity so as to avoid damaging thelight emitter 102. However, thezener diodes 104 are connected when packaging thelight emitter 102. Therefore no element is provided to discharge static electrically before packaging thelight emitter 102. And thelight emitter 102 may be damaged by static electricity before it is packaged. Further, the introduction of thezener diodes 104 will complicate the packaging process thereby incurring extra cost. - Please refer to FIG. 2. FIG. 2 shows a
light emitting diode 150 bonded with a silicon dopeddiode 152 disclosed in a published U.S. patent application 2002/0179914. The silicon dopeddiode 152 is connected to thelight emitting diode 150 with a covalent bond. The silicon dopeddiode 152 is used to release static electricity accumulated on thelight emitting diode 150 to avoid damaging thelight emitting diode 150. However, the covalent bond between the silicon dopeddiode 152 and thelight emitting diode 150 is formed after thelight emitting diode 150 is formed. Therefore thelight emitting diode 150 may be damaged before the covalent bond is formed. And the covalent bond also incur additional expense to the structure. - It is therefore a present invention to provide a light emitter with a voltage dependent resistor layer to solve the aforementioned problem.
- According to the first claimed invention, the light emitter comprises a substrate, and an emitting stack formed on the substrate. The emitting stack comprises a first contact layer having a first surface area and a second surface area, a first cladding layer formed on the first surface area, an emitting layer formed on the first cladding layer, a second cladding layer formed on the emitting layer, and a second contact layer formed on the second cladding layer. The light emitter further comprises a first electrode formed on the second surface area of the first contact layer, a second electrode formed on the second contact layer, and a voltage dependent resistor layer formed on the emitting stack and connected to the first electrode and the second electrode.
- According to the second claimed invention, the light emitter comprises a transparent substrate, and an emitting stack formed on the transparent substrate. The emitting stack comprises a first contact layer having a first surface area and a second surface area, a first cladding layer formed on the first surface area, an emitting layer formed on the first cladding layer, a second cladding layer formed on the emitting layer, and a second contact layer formed on the second cladding layer. The light emitter further comprises a first electrode formed on the second surface area of the first contact layer, a second electrode formed on the second contact layer, a first solder layer formed on the first electrode, a second solder layer formed on the second electrode, a first metal layer formed on the first solder layer, a second metal layer formed on the second solder layer, and a voltage dependent resistor layer connected to the first metal layer and the second metal layer, and a carrier formed on the first metal layer, second metal layer and voltage dependent resistor layer.
- According to the third claimed invention, the light emitter comprises a first electrode, a conductive substrate formed on the first electrode, a Distributed Bragg reflector layer formed on the conductive substrate, a first cladding layer formed on the Distributed Bragg reflector layer, an emitting layer formed on the first cladding layer, a second cladding layer formed on the emitting layer, a second contact layer formed on the second cladding layer, a second electrode formed on the second contact layer, and a voltage dependent resistor layer connected to the first electrode and the second electrode.
- These and other objectives of the claimed invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
- FIG. 1 shows a related art packaged light emitter.
- FIG. 2 shows a light emitting diode bonded with a silicon doped diode disclosed in a published U.S. patent application 2002/0179914.
- FIG. 3 shows a first light emitter according to the present invention.
- FIG. 4 shows a current vs. voltage relationship of the voltage dependent resistor layer in FIG. 3.
- FIG. 5 is an equivalent circuit of the light emitter in FIG. 3.
- FIG. 6 shows a second light emitter according to the present invention.
- FIG. 7 shows a third light emitter according to the present invention.
- Please refer to FIG. 3. FIG. 3 shows a first light emitter1 according to the present invention. The light emitter 1 comprises a
substrate 10, and anemitting stack 9 formed on thesubstrate 10. Theemitting stack 9 comprises afirst contact layer 11 having a first surface area and a second surface area, afirst cladding layer 12 formed on the first surface area, anemitting layer 13 formed on thefirst cladding layer 12, asecond cladding layer 14 formed on the emittinglayer 13, and asecond contact layer 15 formed on thesecond cladding layer 14. The light emitter 1 further comprises afirst electrode 16 formed on the second surface area of thefirst contact layer 11, asecond electrode 17 formed on thesecond contact layer 15, and a voltagedependent resistor layer 18 formed on theemitting stack 9 and connected to thefirst electrode 16 and thesecond electrode 17. - Please refer to FIG. 4. FIG. 4 shows a current vs. voltage relationship of the voltage
dependent resistor layer 18. When voltage across the voltagedependent resistor layer 18 is between VS and VS, the voltagedependent resistor layer 18 exhibits a very high resistance, and current is minimal. When voltage across the voltagedependent resistor layer 18 is not between VS and VS, resistance of the voltagedependent resistor layer 18 decreases as the voltage increases. Therefore, when static electricity induced the voltage across the voltagedependent resistor layer 18 is higher than VS or lower than VS, electric charges will be released through the voltagedependent resistor layer 18. - Please refer to FIG. 5. FIG. 5 is an equivalent circuit of the light emitter1. When static electricity induced voltage across the voltage
dependent resistor layer 18 is higher than VS or lower than VS, electric charges will be released through the voltagedependent resistor layer 18, rather than through theemitting stack 9, thus preventing theemitting stack 9 from being damaged by electric charges. - Please refer to FIG. 6. FIG. 6 shows a
second light emitter 2 according to the present invention. Thelight emitter 2 comprises atransparent substrate 20, and anemitting stack 19 formed on thetransparent substrate 20. Theemitting stack 19 comprises afirst contact layer 21 having a first surface area and a second surface area, a first cladding layer 22 formed on the first surface area, anemitting layer 23 formed on the first cladding layer 22, asecond cladding layer 24 formed on the emittinglayer 23, and asecond contact layer 25 formed on thesecond cladding layer 24. Thelight emitter 2 further comprises afirst electrode 26 formed on the second surface area of thefirst contact layer 21, asecond electrode 27 formed on thesecond contact layer 25, afirst solder layer 28 formed on thefirst electrode 26, asecond solder layer 29 formed on thesecond electrode 27, afirst metal layer 200 formed on thefirst solder layer 28, asecond metal layer 201 formed on thesecond solder layer 29, and a voltagedependent resistor layer 202 connected to thefirst metal layer 200 and thesecond metal layer 201, and acarrier 203 formed on thefirst metal layer 200,second metal layer 201 and voltagedependent resistor layer 202. - Please refer to FIG. 7. FIG. 7 shows a third light emitter3 according to the present invention. The light emitter 3 comprises a
first electrode 36, aconductive substrate 30 formed on thefirst electrode 36, a DistributedBragg reflector layer 31 formed on theconductive substrate 30, afirst cladding layer 32 formed on the DistributedBragg reflector layer 31, an emitting layer 33 formed on thefirst cladding layer 32, asecond cladding layer 34 formed on the emitting layer 33, asecond contact layer 35 formed on thesecond cladding layer 34, asecond electrode 37 formed on thesecond contact layer 35, and a voltagedependent resistor layer 38 connected to thefirst electrode 36 and thesecond electrode 37. - A first transparent oxide
conductive layer 7 can be formed between thefirst electrode first contact layer light emitter 1, 2. A second transparent oxideconductive layer 8 can be formed between thesecond electrode second contact layer light emitter 1, 2, 3. Thesubstrate 10 comprises at least one material selected from a group consisting of Si, GaAs, SiC, GaP, AlGaAs, GaAsP, Al2O3, glass materials, and other replaceable materials. Thetransparent substrate 20 comprises at least one material selected from a group consisting of GaP, AlGaAs, GaAsP, Al2O3, glass materials, and other replaceable materials. Theconductive substrate 30 comprises at least one material selected from a group consisting of GaP, AlGaAs, GaAsP, SiC, GaAs, Si, and other replaceable materials. Each of the transparent oxide conductive layers comprises at least one material selected from a group consisting of indium tin oxide, cadmium tin oxide, antimony tin oxide, zincoxide, zinc tin oxide, and other replaceable materials. Thefirst cladding layer layer second cladding layer first contact layer second contact layer Bragg reflector layer 31 comprises at least one material selected from a group consisting of AlAs, GaAs, AlGaAs, and other replaceable materials. The voltagedependent resistor layer - Compared to the related art, the voltage
dependent resistor layer light emitter 1, 2, 3, thus greatly enhancing the yield of thelight emitter 1, 2, 3. Further, after thelight emitter 1, 2, 3 is formed, no subsequent process is needed to prevent static electricity discharge damage. - Those skilled in the art will readily observe that numerous modifications and alterations of the light emitter may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims (25)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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TW091138188 | 2002-12-26 | ||
TW091138188A TW577184B (en) | 2002-12-26 | 2002-12-26 | Light emitting layer having voltage/resistance interdependent layer |
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US20040125838A1 true US20040125838A1 (en) | 2004-07-01 |
US7095765B2 US7095765B2 (en) | 2006-08-22 |
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US10/249,804 Expired - Lifetime US7095765B2 (en) | 2002-12-26 | 2003-05-09 | Light emitter with a voltage dependent resistor layer |
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US (1) | US7095765B2 (en) |
JP (1) | JP2005005281A (en) |
KR (1) | KR100579202B1 (en) |
DE (1) | DE10322021A1 (en) |
TW (1) | TW577184B (en) |
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WO2012123840A1 (en) * | 2011-03-14 | 2012-09-20 | Koninklijke Philips Electronics N.V. | Led having vertical contacts redistributed for flip chip mounting |
EP2858073A3 (en) * | 2013-10-03 | 2015-06-03 | Kabushiki Kaisha Toshiba | Composite resin and electronic device |
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EP1750309A3 (en) * | 2005-08-03 | 2009-07-29 | Samsung Electro-mechanics Co., Ltd | Light emitting device having protection element |
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WO2012123840A1 (en) * | 2011-03-14 | 2012-09-20 | Koninklijke Philips Electronics N.V. | Led having vertical contacts redistributed for flip chip mounting |
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Also Published As
Publication number | Publication date |
---|---|
KR100579202B1 (en) | 2006-05-11 |
JP2005005281A (en) | 2005-01-06 |
TW577184B (en) | 2004-02-21 |
DE10322021A1 (en) | 2004-07-22 |
KR20040057890A (en) | 2004-07-02 |
TW200411954A (en) | 2004-07-01 |
US7095765B2 (en) | 2006-08-22 |
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